Performance problem after upgrading to 7.5.0.8

[Mark Thomas]

We have just completed an upgrade from 7.3.0.46 to 7.5.0.8 on Linux, and 
have encountered significant performance problems.  Some processes are 
taking upwards of 100x longer to complete than prior to the upgrade.  We 
have ruled out hardware failure and verified that the system has enough 
free memory, and neither processor is fully utilized (the system load is 
quite low).  We have checked knldiag and knldiag.err, and found nothing 
useful.

With the database running, even OS commands have become unresponsive.  We 
have decreased the value of CACHE_SIZE, and the database performance 
actually improved somewhat (though nowhere near the pre-upgrade 
performance).  I wish I could provide more information, but we really have 
no idea what's going on.

Can anyone suggest where we might look next to find the problem?

--
Mark Thomas
United Drugs
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